Pitchblender does not do phase-shifting, at least not in the classic stomp-box way. That's why Wave Mechanics (now called "Sound Toys") will also be releasing their own dedicated phaser very soon. It just got to final beta.

You will love / want both of these phasers, (phasors?) as they are a little different sounding from each other, just like good stomp boxes, and both a KILLER.